body.folder-arrow .nav-files-container {
    & .nav-folder-title:hover .tree-item-icon.collapse-icon,
    & .nav-folder-title:hover .nav-folder-collapse-indicator,
    & .nav-folder-title:hover .tree-item-icon.nav-folder-collapse-indicator 
    {  display: flex; margin-left: -2px; }

    & .tree-item-self.is-active .collapse-icon svg 
    { color: var(--text-dl); }

    & .nav-folder-children .nav-folder-title:hover .nav-folder-title-content::before
    { margin-left: var(--file-icon-margin); }
}

body.folder-arrow-display {
    .nav-folder .tree-item-icon.collapse-icon {
        margin-right: 4px;
    }
}